(trademark) an operating system with a graphical user interface
"After years of struggling with command lines, she finally decided to switch her laptop's software to Windows for its intuitive mouse and window controls."
plural of window
"The storm damaged three of our front windows, so we need to order replacements immediately."
In plain English: Windows are the glass openings in a wall that let light in and air out.
"The morning sun shone brightly through the windows."
Third-person singular simple present indicative form of window
"The cat cannot windows its way out of the locked room because it lacks the necessary physical ability to transform into a pane of glass."
In plain English: To windows means to open a window so that fresh air can come inside.
"The security guard saw that someone was trying to window the display case before they could grab anything."
Microsoft Windows, an operating system with a WIMP graphical user interface that dominates the personal computer market.
"My laptop runs smoothly on the latest version of Microsoft Windows."
The word comes from the existing English term for glass panes set into frames. It was adopted by Microsoft to describe the rectangular areas on a computer screen that display programs and information.